Final answer:
Angiectasis is the correct term for the dilation of a blood or lymph vessel. 4) Angiectasis is a surgical procedure to widen blocked arteries, not a term for vessel dilation.
Step-by-step explanation:
The dilation of a blood or lymph vessel is referred to as angiectasis. This term specifically means an expansion or stretching of the vessel, and it is not to be confused with procedures or other vascular terms.
Angioplasty is a procedure that involves the mechanical widening of an artery that is partially blocked with plaque. A balloon is used to dilate the artery to increase blood flow, but this does not mean angioplasty is synonymous with either vasodilation or angiectasis. Among the options provided, option 4, 'angiectasis,' correctly refers to the dilation of a blood or lymph vessel.